Have you ever fixed yours with a coupler?

Just like it says. I have 3, 1 1/2" X 10/32 screws holding my piston stop, (made of wood), my piston, (also wood) has hit it hard enough to hammer it back breaking the pipe it's screwed to, (5 shots). The pipe cracked long ways. I think i all ready came up with a quick fix, (long lasting i hope). I'm going to cut the pipe in half at the screws and glue it back together with a coupler, then rescrew the stop block in place.

I had the same problem, but I calculated a safty in the gun. The block was not the end of the pipe. The pipe was made a bit longer, the block is zitting in the middel. I filled the pipe up with a metal thin pipe (5 mm) tapen al around so it fits in the bigger pipe, due to reduce the pilot volume.

I used a spring as a block, the spring was smashed into the copper block, and I mean IN, not inside. The block got destroyed, the spring also, and the piston dammaged. At 130 psi.

The strongest shot was about 40psi according to the gauge, i cut it in half this morning, and fished out all of the busted piston block pieces. After pondering the damage i relized that the block didn't fit snuggly inside the pipe. Allowing it to get hammered sideways and that is how the pipe got cracked. I allready had a spring in it, but it's not very strong. Now that i can access the back of the piston, i'm gonna get a longer stronger spring for the piston. It's a world of difference when venting the pilot chamber with the modded sprinkler valve! As for the screws, i did away with them by glueing in some left over pvc pipe for a piston block, i didn't think about useing a rubber bumper along with the stop. I wish i would have! You see, i didn't do my homework and now i pay the price!!